measured at the ship was air that was closer to the sea 

 surface at the buoy location and had risen to pass over 

 the ship. If this is so — and we have no reason to 

 think otherwise — then to obtain accurate wind profiles 

 we must use data measured only on buoys and preferably 

 with sensors at three heights; two heights yield the 

 typical logarithmic profile and the third height yields 

 a check point on the curvature. 



From this experience in MILOC 67j we designed a new 

 meteorological buoy [Fig. ?] for use in the Ionian Sea 

 in MILOC 68 [Fig. 8]. The meteorological buoy was built 

 with sensors for wind speed and dry and wet-bulb 

 temperatures at 2 m, 4m and 8 m above the nominal-mean 

 sea-surface. 



A major part of MELOC 68 was an experiment to measure 

 the turbulent diffusion processes in the surface waters. 

 For this we built six large drogues [Fig. 9] which were 

 installed in the water and allowed to drift freely for 

 several weeks. It is supposed that their motion is 

 determined almost exclusively by the surface currents 

 since their size below the surface was 16 m^ and only 

 a radar reflector showed above surface. They were 

 tracked by the several ships involved in MILOC 68 and 

 hourly reports on the position of everything were 

 transmitted to the MARIA FAOLINA G. A picture of the 

 motion of two of the drogues [Fig. 10 ] shows the very 

 random and turbulent motion during a six-day period; if 

 one knew only that a certain mass of water at the starting 

 position had arrived at the recovery position six days 

 later, very likely the inference as to water-mass speed, 

 location, and direction at any one of the intervening days 

 would be in error. 



Attached to four of the drogues were 60-m long 

 thermistor chains containing 21 thermistors spaced along 

 the length. A typical output [Fig. ll] from the 

 meteorological equipment on the MARIA FAOLINA G. gives 

 wind and radiation data " synoptically" with the distri- 

 bution of subs^^rface temperatures from one of the drogues; 

 the ship was near to, but not coincident with, the drogue. 

 One can observe the thermocline moving about in response 

 to changes in wind stress and solar radiation. There is 

 also an internal-wave structure that appears to end a day 

 or so after a period of high winds has ended. We will 

 continue this type of work. 



67 



